code: def forward_net(self, rays_d_encoding: torch.Tensor) -> torch.Tensor:
      return self.background_net(rays_d_encoding)
  
file_path: NeMo/nemo/collections/multimodal/modules/nerf/background/torchngp_background.py
imports: from typing import Dict
  import torch
  from nemo.collections.multimodal.modules.nerf.background.nerf_background_base import NeRFBackgroundBase
  from nemo.collections.multimodal.modules.nerf.geometry.layers import MLP
  from nemo.collections.multimodal.modules.nerf.utils.torch_ngp.encoding import get_encoder
label_desc: Use image node_id 3 for calling the TorchNGPBackground obj's underlying member method code with example usage: obj.forward_net(rays_d_encoding) and returns: self